DataTable Retrives another DataTable Information?

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C#

ASP.NET

C#4.0

I Have an Exception in my Live Application..DataTable Retrives another DataTable information..

if (HttpContext.Current.User != null)
           {

               if (Session["username"] != null)
               {
                   string pageName = Page.Page.AppRelativeVirtualPath.Substring(Page.Page.AppRelativeVirtualPath.LastIndexOf('/') + 1);
                   DataTable dtFeatures2 = new DataTable();
                   dtFeatures2.Clear();
                   objMatermenuPL.usertype = Session["UserType"].ToString();
                   dtFeatures2 = objMastermenuBAL.GetMastermenu(objMatermenuPL);

                   DataView dt = new DataView(dtFeatures2);
                   dt.Sort = "fld_feature ASC";

                   if (dtFeatures2 != null)
                   {
                       foreach (Control control in leftpanel.Controls)
                       {
                           Type ty = control.GetType();
                           if (ty.Name.ToUpper() == "HTMLANCHOR")
                           {
                               int i = dt.Find(control.ID.Substring(3));
                               if (i < 0 && control.ID.Contains("lnk"))
                                   control.Visible = false;
                               if (control.ID.Contains("lnk") && control.ID.Substring(3) + ".aspx" == pageName)
                               {
                                   HtmlAnchor a = (HtmlAnchor)control;
                                   a.Attributes.Add("class", "active");
                               }
                           }
                       }
                   }


               }
           }
           else
           {
               Response.Redirect("~/Login.aspx");
           }

This code we use All most all master pages...If an exception Raise,then it comes directly
this line..

dtFeatures2 = objMastermenuBAL.GetMastermenu(objMatermenuPL);

Message like : Cannot find column fld_feature.

"dtFeatures2" is Filled With Before Opened Page DataTable Information...

This exception gone after some..It's Working Fine 100%....Some times only shows these exception...